diff --git a/README.md b/README.md
index 4752a41df05c7b32fb0530647fa9e5c6b1542d59..ef2aa0809f25ed0fa09a0daa57e403a8389da002 100644
--- a/README.md
+++ b/README.md
@@ -19,7 +19,6 @@ When an application needs to perform tasks that do not require high real-time pe
 
 ├── frameworks       # Frameworks
 ├── interfaces
-│   ├── innerkits    # Internal APIs
 │   └── kits         # External APIs
 ├── sa_profile       # SA profile
 ├── services         # Services
@@ -30,17 +29,44 @@ When an application needs to perform tasks that do not require high real-time pe
 
 ### Available APIs<a name="section114564657874"></a>
 
-API                                                      |     Description                         
----------------------------------------------------------|-----------------------------------------
-function startWork(work: WorkInfo): boolean; | work scheduler application
-function stopWork(work: WorkInfo, needCancel?: boolean): boolean;        | work scheduler cancel 
-function getWorkStatus(workId: number, callback: AsyncCallback<WorkInfo>): void;| get the status of work（Callback form） 
-function getWorkStatus(workId: number): Promise<WorkInfo>; | get the status of work（Promise form） 
-function obtainAllWorks(callback: AsyncCallback<void>): Array<WorkInfo>;| get all works（Callback form） 
-function obtainAllWorks(): Promise<Array<WorkInfo>>;| get all works（Promise form） 
-function stopAndClearWorks(): boolean;| stop and clear work
-function isLastWorkTimeOut(workId: number, callback: AsyncCallback<void>): boolean;| Get whether the last task has timed out（Callback form）
-function isLastWorkTimeOut(workId: number): Promise<boolean>;| Get whether the last task has timed out（Promise form）
+1. The members of WorkInfo
+
+ API                                                          | Description | Type
+  ------------------------------------------------------------ | ------------------------------------------------------------ | ------------------------------------------------------------ 
+workId | The id of work（required）|number
+bundleName | The bundle name（required）|string
+abilityName | The ability name（required）|string
+networkType | The type of network | NetworkType
+isCharging | Is charging. | bool
+chargerType | The charging type. | ChargingType
+batteryLevel | The  battery | number
+batteryStatus| The battery status |	BatteryStatus
+storageRequest|The storage status|	StorageRequest
+isRepeat|Is repeating work |	boolean
+repeatCycleTime | The repeating cycle time|	number
+repeatCount	| The repeating cycle count| number
+
+
+2. The api of work scheduler for starting, stopping and querying.
+
+ API                                                          | Description                                                  
+ ------------------------------------------------------------ | ------------------------------------------------------------ 
+ function startWork(work: WorkInfo): boolean;                 | work scheduler application                                   
+ function stopWork(work: WorkInfo, needCancel?: boolean): boolean; | work scheduler cancel                                        
+ function getWorkStatus(workId: number, callback: AsyncCallback<WorkInfo>): void; | get the status of work（Callback form）                      
+ function getWorkStatus(workId: number): Promise<WorkInfo>;   | get the status of work（Promise form）                       
+ function obtainAllWorks(callback: AsyncCallback<void>): Array<WorkInfo>; | get all works（Callback form）                               
+ function obtainAllWorks(): Promise<Array<WorkInfo>>;         | get all works（Promise form）                                
+ function stopAndClearWorks(): boolean;                       | stop and clear work                                          
+ function isLastWorkTimeOut(workId: number, callback: AsyncCallback<void>): boolean; | Get whether the last task has timed out（For repeat work. Callback form） 
+ function isLastWorkTimeOut(workId: number): Promise<boolean>; | Get whether the last task has timed out（For repeat work. Promise form） 
+
+3. Callback api of work scheduler
+
+API                                                          | Description                                                  
+ ------------------------------------------------------------ | ------------------------------------------------------------ 
+ function onWorkStart(work: WorkInfo): void;                 | Callback when work starts.       
+ function onWorkStop(work: WorkInfo): void;                 | Callback when work stops.
 
 ### Usage Guidelines<a name="section129654513264"></a>
 
@@ -51,6 +77,13 @@ When an application needs to perform tasks with low real-time performance, work
 Adhere to the following constraints and rules when using work scheduler:
 
 - **Timeout**：The longest running time is 120s each time.
+- **Restrict to WorkInfo**：
+
+(1) WorkId, bundleName and abilityName are required.
+
+(2) At least one condition must be set.
+
+(3) Repeatcycletime should be at least 20 minutes. When setting repeatcycletime, you must select one of isrepeat and repeatcount.
 
 ## Repositories Involved<a name="section1371113476307"></a>